Concrete pipe stripper



June 5, 1934- B. J. UKROPINA CONCRETE PIPE STRIPPER 5 Shets-Sheet 1Filed Sept. 29, 1951 m. N 3 MN MW.

.m H w x J erm A Ill I l I III I m Ii P m uh a. t

AN 02 5 m2 ATTORNEY.

June 5, 1934.

Filed Sept. 29 1931 PIE'.E

3 Sheets-Sheet 2 INVENTOR.

B.J- UKROPI NR.

ATTORNEY.

June 5, 1934. J. u op 1,961,261

CONCRETE PIPE STRIPPER Fild Sept. 29, 1931 a Sheets-Sheet 3 BJ UKROPINH.

ATTORNEY Patented June 5 1934 UNITED STATES PATENT oFFlE 4 Claims.

This invention relates to improvements in concrete pipe strippers.

The general object of the invention is to provide an improved device forremoving concrete pipes 5 from the molds in which they have been formed.

A further object of the invention is to provide a device of the classdescribed by means of which the pipe may be supported and transportedafter it hasbeen removed from the mold.

A specific object of the invention is to provide a device of the classdescribed which includes a car upon which a concrete pipe in its formingmold is positioned and another car including means for engaging andsupporting the concrete pipe, and means to force the first car away fromthe second car to thereby remove the pipe from the forming mold.

Other objects and advantages of this invention will be apparent from thefollowing description taken in connection with the accompanying drawingswherein:

Fig. 1 is a side elevation of my improved stripping device showing aconcrete pipe about to be removed from its forming mold.

Fig. 2 is a plan view of the stripping device with the mold omitted andshowing the mold car as bein oved away from the stripper car.

Fig. 3 is an enlarged section taken on line 3--3 of Fig. 1.

Fig.4 is an enlarged rear end view of the device shown in Fig. 1.

Fig. 5 is an enlarged fragmentary section taken on the line 5-5 of Fig.1.

Fig. 6 is a section taken on line 6-6 of Fig. 5.

Fig. 7 is a diagrammatic view showing the air line hook up with thecontrol valves both in an exhaust position.

Fig. 8 is a diagrammatic View showing the control valve moved toposition to cause the ram to be moved outwardly, and

Fig. 9 is a similar view showing the control valves moved to position tocause the ram to be moved inwardly.

Referring to the drawings by reference characters it will be seen thatthe device includes a mold car indicated generally at 10 and a strippercar which is indicated generally at 12. The mold car 10 comprises aframe 13 having wheels 14 mounted thereon which are adapted to operateon rails 15. At the center of each end of the frame 13 I provide a shoel6 and on top of the frame 13 and extending transversely thereof Iprovide a pair of spaced rails 1'7 which extend outwardly from each sideof the frame.

The car 10 is preferably adapted to operate in a pit between twoplatforms 18 as shown in Fig. 3 and the rails 17 on the 'car are adaptedto be aligned with similar rails 19 on the platforms 18.

The stri per car 12 comprises a frame 20 which fi l is wider than themold car 10 andincludes a setion 21 on each side between whichthe moldcar is positioned at the beginning of the stripping operation. Thestripper car 12 like the mold car' 10 includes a plurality of wheels 23which are 6 adapted to operate on rails 24 spaced outside of the rails15.

Adjacent the front of the stripper car 12 I provide a vertical frame 25which includes spaced vertical channel irons 26 with their side flanges'79 facing fore and aft and spaced apart (see Figs. '5 and .6), Thevertical frame 25 is preferably provided w' h suitable bracing suchasthemem 'bers 26 which extend from adjacent the top of the frame 25rearwardly and downwardly to the frame 20. v Positioned in the verticalframe 25 I provide a carrier block 2'7 which is shaped to conform to theinterior of the channels 26 and includes a portion which extends outwardbetween the flanges of the channels and to which retainer plates 28 aresecured. The carrier block 2'7 is adapted to have vertical movement inthe frame 26. Piv otally connected to the carrier block 27 adjacent thetop thereof in a recess 2'7 as at 29 I provide a member 30 whichincludes an upwardly extending screw threaded shank 31. 'As shown theshank 31 extends upwardly between two transverse channel members 32,through a plate 33 and through a threaded hand wheel 34 which engagesthe plate 33; s i

Positioned in the recess 2'7 of the carrier block 2'7 and pivotallyconnected to the carrier block as at 35 I provide a beam 36 which isshown as comprising an I-beam. The beam 36 extends forwardly from the'verticalframe 25 to a point intermediate the length of theforwardlyextending portion 21 of the car 12 and it extends rearwardly toadjacent the rear end of the car 12. Adjacent the forward end of thebeam 36 I providea bearing member 3'7 in which a pivot pin 38ispositioned.

Supported by the pivot pin 38 I provide a pipe shoe supporting frame 39which includes spaced side plates 40 which are mounted on the pin 38.The side plates 40 are connected adjacent their upper ends by atransverse member 41 and adiacent the lower ends of thep'lates 40 Ipivotally secure thereto as "at 42 one end of a bracing rod 43. Theopposite end of the bracing rod 43 is piv- 1 10 otally connected to thecarrier block 27 as at 44. The bracing rod 43 is made in two sectionsconnected by a turnbuckle 45 to allow adjustment of the length thereof.

Secured to each of the side plates 49 adjacent the upper ends thereof Iprovide longitudinally extending angle iron members 46 which areconnected at each end by transverse angle iron members 47 which may bewelded or otherwise suitably secured thereto.

Removably positioned on the shoe supporting frame 39 I provide a pipeshoe 48. As shown the shoe 48 comprises an arcuately shaped plate 49 onthe outer surface adjacent each longitudinal side of which is positioneda pad 50 which may be made from a strip of canvas belting. On the underside of the plate 49 and adjacent the pads 56 I secure longitudinallyextending angle iron members 51 to which angularly downwardly extendingplates 52 are secured. When the pipe shoe 48 is operatively positionedon the supporting frame 39 the lower ends of the plates 52 rest on theangle iron members 46 of the supporting frame and the end members 47 ofthe supporting frame prevent longitudinal movement of the shoe 48relative to the frame 39.

Pivotally mounted on a transverse member 53 which is secured to themembers 46 of the frame 39 as at 54 I provide a rod 55. On the oppositeend of the rod 55 I pivotally mount as at 56 a wedging shoe 57. On therod 55 I provide a hooked latch member 58 which in one position isadapted to be engaged by a hook member 59 pivotally secured to one ofthe side plates 40 of the frame 39. Adjacent the rear of the car 12 Iprovide a vertical frame 60 to which I pivotally mount as at 61 a member62 (see Fig. 4). Rotatably positioned in the member 62 I provide anupwardly extending screw threaded shank 63 which passes through and issecured to a hand wheel 64 which rests on the upper surface of the block62. Positioned on the shank 63 above the hand wheel 64 I provide amember 65 which includes a threaded aperture in which the shank 63 ispositioned. The member 65 is pivotally connected as at 66 to arearwardly extending arm 67 secured to the beam 36.

Mounted in the center of the car 12 and extending longitudinallytherealong I provide a cylinder 68 having a piston 69 therein to which apiston rod or ram 70 is secured. Secured to the frame 20 of the car 12forward of the vertical frame 25 I provide a bearing member 71 throughwhich the ram 70 extends and forward of the a shut-off valve 78 bearingmember 71 I provide an enlarged head 72 on the ram 70.

For operating the piston 69 in the cylinder 68 I provide on each side ofthe cylinder 68 a fluid tank 73 and on the opposite side a similar tank74.

As shown in Fig. 7 the tank 73 is connected to the rear end of thecylinder 68 by a pipe 75 and the tank 74 is connected to the forward endof the cylinder by a pipe 76. The tanks 73 and 74 are shown as connectedby a pipe 77 having interposed therein. When the device is in operationthe valve 78 is closed and is only opened at the time a new supply offluid is put in the tanks to equalize the levels in both tanks.

For causing operation of the piston 69 in the cylinder 68 I provide apair of control valves 79 and 80 which are preferably mounted on anoperating panel 81 adjacent the rear of the car 12. The valves 79 and 80are each three-way valves having an inlet 82, an outlet 83 and anexhaust port 84. The passageway from one port to another in each valveis controlled by a rotor 85 which includes a recessed passageway 86which will only connect two of the ports at a time. The rotors are shownas adapted to be operated by handles 87. The inlet port 82 of each ofthe valves communicate with an air supply pipe 88 and the exhaust portsmay communicate with exhaust pipes 89 if desired.

The supply pipe 88 may communicate with any desired form of air supplydesirable such as with an air hose connected to an air compressor andmounted on a retrieving reel.

The outlet port 83 of the valve 79 communicates with a pipe 90 whichextends to the tank 73 and the outlet port 83 of the valve 86communicates with a pipe 91 which extends to the tank 74. When the valverotors 85 of both the valve 79 and 80 are in the position shown in Fig.7 the air in the tank 73 and the tank 74 is exhausted therefrom. Thisposition is the normal inoperative position of the control valves 79 and80.

When it is desired to move the piston 69 forwardly and the ram 70 to anextended position the valves 79 and 80 are set in the position shown inFig. 8. In this position communication is afforded in the valve 86between the exhaust port 84 and the outlet port 83 thereof thus it willbe seen that the air in the tank 74 will be open to the atmosphere. Thevalve 79 in this position affords communication between the outlet port83 and the inlet port 82 thereof whereupon compressed air from thesupply pipe 88 passes through the valve 79, through the pipe 90 into thetank 73 forcing the fluid therein through the pipe 75 into the rear ofthe cylinder 68. As the fluid enters the rear of the cylinder 68 itexerts pressure on the rear of the piston 69 thereby forcing the pistonforwardly and the fluid in the cylinder in front of the piston throughthe pipe 76 into the tank 74.

When it is desired to move the piston 69 rearwardly to retract the ram70 the valves 79 and 80 are set in the positions shown in Fig. 9. Inthis position communication is afforded in the valve 79 between theexhaust port 84 and the outlet port 83 thereof, thus it will be seenthat the air in the tank 73 will be exhausted to the atmosphere. Thevalve 80 in this position affords communication between the outlet port83 and the inlet port 82 thereof whereupon compressed air from thesupply pipe 88 passes through the valve 80, through the pipe 91 into thetank 74, forcing the fluid therein through the pipe 76 into the forwardend of the cylinder.

As the fluid enters the front of the cylinder 68 it exerts a pressure onthe front of the piston 69 thereby forcing the piston rearwardly and thefluid in the cylinder in the rear of the piston through the pipe 75 intothe tank 73. After the piston has reached the limit of its rearwardtravel the rotor 85 of the valve 80 is turned to the exhaust position asshown in Fig. 7.

The stripper car 12 is preferably self propelling and for this purpose Iprovide a sprocket wheel 93 which is secured to a shaft 94 of one of thepair of wheels 23 of the car 12. The sprocket 93 is driven by a sprocketchain 95 from a sprocket 96 secured to the drive shaft 97 of atransmission mechanism 98. The transmission mechanism 98 may be of anydesired type and is shown as adapted to be driven by a motor 99 which ispref erably an air motor.

In operation when it is desired to remove a conpipe.

cret'e pipe such as the pipe 100 from themoldlOl in which it has beenformed'usually by the centrifugal process, the car 10 is moved to aposition wherein the rails 17 thereon align with the rails 19 on whichthe pipe to be stripped is positioned.

As shown the mold 101 is of a type which comprises a metal shell 102having spaced metal tires 103 thereon. The mold is placed on the rails19 in a position wherein the tires 103 are on the outside of the rails19.

When the car 10 has been aligned with the rails 19 the mold is rolledalong the rails 19 and onto the rails 17 on the car 10. After centeringthe mold on the car 10 chocks 104 are preferably placed in position toprevent the mold from rolling off the car.

If the beam 36 is not at the correct height the operator adjusts it byraising or lowering the carrier block 2'7 by means of the hand wheel 34,after which the operator adjusts the shoe 48 to the correct height toenter the pipe 100 by turning the hand wheel 64. The operator thenswings the rod 55 towards the beam 36 so that the hook member 59 engagesthe latch member 58 and retains the wedging shoe in a raised position.The stripper car 12 is then run along the rails 24 until the enlargedhead 72 of the ram engages the shoe 16 on the car 10. In this positionof the car 12 the pipe shoe 48 has entered the pipe 100. The operatorthen raises the forward end of the beam 36 by rotating the hand wheel 64to lower the rear end of the beam until the shoe 48 engages the innersurface of the pipe 100. After the shoe 48 engages the pipe 100 theoperator continues to raise the forward end of the beam 36 until theWeight of the pipe and mold is carried by the beam and not by the rails17.

The operator then releases the hook 59 from the latch 58 whereupon thewedging shoe 5'7 swings downward into engagement with the interior ofthe pipe 100. The wedging shoe 57 when in engagement with the pipewedges the pipe shoe into tighter engagement should the pipe shoe startslipping when the mold is being removed.

The various elements are now in a correct position to strip the pipe 100from the mold 101 as shown in Fig. 1.

The operator now sets the control valve 79 in the position shown in Fig.8 to allow compressed air to enter the tank 73 to force fluid therefrominto the rear of the cylinder 68 to thereby move the piston 69 and theram 70 forward as previously described. As the ram moves outwardly itpushes the mold car 10 away from the stripper car 12 as shown in Fig. 2.

As the mold car 10 moves away from the stripper car 12 the tire 103 atthe forward end of the mold engages the adjacent rail 17 which moves themold 101 with the car 10. The wedging shoe 57 prevents the pipe shoe 48from slipping on the pipe so as the mold car moves away from thestripper car the pipe 100 remains stationary and the mold 101 is movedoff of the After the ram 70 has reached the limit of its stroke theoperator sets the control valves 79 and 80 in the positions shown inFig. 9 to retract the ram as previously described.

Suitable skids are then placed from one platform 18 to the other andthen the operator raises the rear end of the beam 36 by means of thehand wheel 64 to lower the forward end of the beam until the pipe restson the skids. The operator then latches the wedging shoe 57 in a raisedposition and the forward end of the beam is further'lowere'd untilthepipe shoe 48 moves out of engagement with the pipe 100. Whereupon theoperator runs the strippercar 12 along the rails 24 away'from the pipe100' until the pipe shoe 48 fully clearsthe pipe; The pipe 100 is thenrolledon the skids onto the rails 19 on the opposite platform from whichit was originally taken. After removing the skids and the empty moldfrom the mold car the device is ready to repeat the various strippingoperations just described.

From the foregoing description it will be apparent that I have provideda novel concrete pipe stripping device which is simple in constructionand highly efficient in use.

Having thus described my invention, I claim:

1. In a concrete pipe stripper, a stripper car, a vertical frame on saidstripper car, a carrier block vertically movable in said frame, means tomove said carrier block, a beam extending longitudinally of saidstripper car, said beam being pivotally connected to said carrier block,a frame pivotally connected to one end of said beam, means to preventaccidental swinging of said frame, said means including a rod secured atone end to said frame and at the opposite end to said carrier block, apipe shoe removably mounted on said frame, and means adjacent the end ofsaid beam opposite said shoe to swing said beam about its pivotalconnection to said carrier block.

2. In a concrete pipe stripper, a stripper car, a beam extendinglongitudinally of said stripper car and being pivotally supported onsaid stripper car, a frame pivotally connected to one end of said beam,means to prevent accidental swinging of said frame, a pipe shoeremovably mounted on 11111 said frame, means adjacent the end of saidbeam opposite said shoe to swing said beam about its pivotal support, amold car, said mold car being adapted to have a mold containing aconcrete pipe positioned thereon, said mold shoe being 1-15 adapted toengage the inner surface of the pipe on said mold car and the shoe endof said beam being adapted to be raised to support the weight of saidpipe, a movable ram supported on said stripper car, said ram beingadapted to engage said mold car, means to move said ram to thereby movesaid mold car away from said stripper car, and means to move said ram inthe opposite direction.

3. In a concrete pipe stripper, a stripper car, 3126 a vertical frame onsaid stripper car, a carrier block vertically movable in said frame,means to move said carrier block, a beam extending longitudinally ofsaid stripper car, said beam being pivotally connected to said carrierblock, a frame pivotally connected to one end of said beam, means toprevent accidental swinging of said frame, a pipe shoe removably mountedon said frame, means adjacent the end of said beam opposite said shoe toswing said beam about its pivotal connection to said carrier block, amold car, said mold car being adapted to receive a mold containing aconcrete pipe, said mold shoe being adapted to engage the inner surfaceof the pipe on said mold car and the shoe end of said 1% beam beingadapted to be raised to support the weight of said pipe, a cylinder onsaid stripper car, a piston in said cylinder having a ram securedthereto, said ram being adapted to engage said mold car, means to movesaid piston to cause 45 said ram to move said mold car away from saidstripper car, and means to move said piston in the opposite direction.

4. In a concrete pipe stripper a pair of outer rails, a pair of innerrails, a stripper car, said stripper car havingwheels thereon engagingsaid outer rail, a mold car, said mold car having wheels thereonengaging said inner rails,- said stripper car including forwardlyprojecting portions beportions, said ing arranged at spaced forwardlyprojecting each side of said mold car, a beam

